Irish is Sasanach Scottish is Sasannach
Scottish Gaelic is the form of Gaelic spoken in Scottland, so those people would probably just be considered Scottish.
A person who speaks Gaelic.
Scotland speaks English and Gaelic. However, English is much more prominent than Gaelic.
A person who speaks two languages is called a bilingual.
The person who speaks for another is called a spokesperson or a representative. They convey the thoughts, beliefs, or actions of the person or group they are representing.
A polyglot is a person who speaks several languages proficiently.
Eulogy
A person who speaks and understands many languages can be called a polyglot.
A person who speaks French as their first language is called a Francophone.
Ireland and Scotland.
The speed at which a person speaks is called their "speaking rate" or "speech rate." It is typically measured in words per minute (wpm).
When a person speaks to an audience, it is called public speaking. It involves delivering a message or speech to a group of people in a public setting.